Holdawayite
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About Holdawayite
Formula:
Mn6(CO3)2(OH)7(Cl,OH)
Colour:
light to bright pink
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3. 19 - 0
Crystal System:
Monoclinic
Name:
Named in honor of Michael Jon Holdaway (b. 1936), professor of petrology and Southern Methodist University, Dallas, Texas, USA, for his contributions to mineralogy ind petrology and for his efforts as editor of the American Mineralogist.
This page provides mineralogical data about Holdawayite.
Classification of Holdawayite
Approved
Approval year:
1986
First published:
1988
5/C.06-20
5.BA.20
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
16b.4.2.2
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZq
11.12.2
11 : Carbonates
12 : Carbonates of Mn
11 : Carbonates
12 : Carbonates of Mn
Physical Properties of Holdawayite
Vitreous
Transparency:
Translucent
Colour:
light to bright pink
Comment:
It gradually changes to a brown color on exposure and in some cases has developed a thin black sooty coating that masks the true color
Streak:
light pink
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100}
{100}
Density:
3. 19 - 0 g/cm3 (Measured) 3.24 g/cm3 (Calculated)
Optical Data of Holdawayite
Type:
Biaxial (-)
RI values:
nα = 1.644(1) nβ = 1.719(1) nγ = 1.721(1)
2V:
Measured: 12° to 18°, Calculated: 16°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong
Pleochroism:
Non-pleochroic
Chemical Properties of Holdawayite
Formula:
Mn6(CO3)2(OH)7(Cl,OH)
IMA Formula:
Mn2+6(CO3)2(OH)7(Cl,OH)
Crystallography of Holdawayite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 23.437(5) Å, b = 3.3137(3) Å, c = 16.618(6) Å
β = 111.15(2)°
β = 111.15(2)°
Ratio:
a:b:c = 7.073 : 1 : 5.015
Unit Cell V:
1,203.67 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001165 | Holdawayite | Peacor D R, Rouse R C (1988) Holdawayite, Mn6(CO3)2(OH)7(Cl,OH), a structure containing anions in zeolite-like channels American Mineralogist 73 637-642 |  | 1988 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.93 Å | (100) |
| 7.77 Å | (40) |
| 5.459 Å | (80) |
| 3.879 Å | (70) |
| 2.926 Å | (40) |
| 2.690 Å | (60b) |
| 2.589 Å | (50b) |
Type Occurrence of Holdawayite
General Appearance of Type Material:
subhedral crystals approximately 2 cm in diameter
Place of Conservation of Type Material:
Type material is deposited at the Smithsonian Institution under catalogue no 163209 and at the National Museum of Natural History, Ottawa, under NMNS no 51510
Geological Setting of Type Material:
tectonically intercalated manganese and iron ores, which are locally dominated by carbonate- and silicate-facies rocks rather than by the more usual hausmannite ores.
Associated Minerals at Type Locality:
Reference:
Peacor, D.R., Essene, E.J., Rouse, R.C., Dunn, P.J., Nelen, J.A., Grice, J.D., Innes, J., von Knorring, O. (1988) Holdawayite, a new manganese hydroxyl-carbonate from the Kombat mine, Namibia. American Mineralogist: 73: 632-636.
Synonyms of Holdawayite
Other Language Names for Holdawayite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
| 5.BA.05 | Azurite | Cu3(CO3)2(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Georgeite | Cu2(CO3)(OH)2 · 6H2O | Amor. |
| 5.BA.10 | Glaukosphaerite | (Cu,Ni)2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Kolwezite | CuCo(CO3)(OH)2 | Tric. |
| 5.BA.10 | Malachite | Cu2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Mcguinnessite | (Mg,Cu)2(CO3)(OH)2 | Mon. 2/m |
| 5.BA.10 | Nullaginite | Ni2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Pokrovskite | Mg2(CO3)(OH)2 | Mon. |
| 5.BA.10 | Rosasite | (Cu,Zn)2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Zincrosasite | (Zn,Cu)2(CO3)(OH)2 | Mon. |
| 5.BA.10 | Chukanovite | Fe2+2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.15 | Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 | Mon. 2/m : P21/m |
| 5.BA.15 | Hydrozincite | Zn5(CO3)2(OH)6 | Mon. 2/m : B2/m |
| 5.BA.25 | Defernite | Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x | Orth. mmm (2/m 2/m 2/m) : Pnma |
| 5.BA.25 | UM1977-03-COSiO:CaClH | Ca10-11(CO3)7(SiO4)Cl1-2(OH)1-2 | Mon. |
| 5.BA.30 | Loseyite | (Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10 | Mon. 2/m |
| 5.BA.30 | Sclarite | Zn7(CO3)2(OH)10 | Mon. 2/m : B2/b |
Related Minerals - Dana Grouping (8th Ed.)
| 16b.4.2.1 | Defernite | Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x | Orth. mmm (2/m 2/m 2/m) : Pnma |
Related Minerals - Hey's Chemical Index of Minerals Grouping
| 11.12.1 | Rhodochrosite | MnCO3 | Trig. 3m (3 2/m) : R3c |
| 11.12.3 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O | Trig. 3m (3 2/m) |
| 11.12.4 | Kutnohorite | CaMn2+(CO3)2 | Trig. 3 : R3 |
Fluorescence of Holdawayite
None
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Holdawayite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Peacor, D.R., Essene, E.J., Rouse, R.C., Dunn, P.J., Nelen, J.A., Grice, J.D., Innes, J., von Knorring, O. (1988) Holdawayite, a new manganese hydroxyl-carbonate from the Kombat mine, Namibia. American Mineralogist: 73: 632-636.
Peacor, D.R., Rouse, R.C. (1988) Holdawayite, Mn6(CO3)2(OH)7(Cl,OH), a structure containing anions in zeolite-like channels. American Mineralogist: 73(5-6): 637-642.
Dunn, P.J. (1991) Rare minerals of the Kombat mine. The Mineralogical Record: 22: 421-425.
Mernagh, T.P., Kamenetsky, V.S., Kamenetsky, M.B. (2011) A Raman microprobe study of melt inclusions in kimberlites from Siberia, Canada, SW Greenland and South Africa. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy: 80(1): 82-87.
Internet Links for Holdawayite
mindat.org URL:
https://www.mindat.org/min-1919.html
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Localities for Holdawayite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Germany | |
| Wittern: "Mineralfundorte in Deutschland", 2001 |
| Der Aufschluss Vol.55, March/April 2004 |
Namibia (TL) | |
| Peacor, D.R., Essene, E.J., Rouse, R.C., Dunn, P.J., Nelen, J.A., Grice, J.D., Innes, J., von Knorring, O. (1988) Holdawayite, a new manganese hydroxyl-carbonate from the Kombat mine, Namibia. American Mineralogist: 73: 632-636. |
Romania | |
| http://minerals-of-the-carpathians.eu; Udubasa, G., Hartopanu, P., Ilinca, G. (1996). The Regionally metamorphosed Fe-Mn Ore Deposit at Razoare, Preluca Mts., Romania. Romanian Journal of Mineralogy, 77, 3-20. |
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Kombat Mine, Kombat, Grootfontein, Otjozondjupa Region, Namibia